/Engine/Source/Editor/UnrealEd/Public/LevelEditorViewport.h
Checks the viewport to see if the given object can be dropped using the given mouse coordinates local to this viewport
virtual [FDropQuery](API\Editor\UnrealEd\FDropQuery) CanDropObjectsAtCoordinates ( int32 MouseX, int32 MouseY, const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetInfo )